Device for locking elevators.



No. 740,568. PATENTED' 00w. 6; 1903.

I D. 0. JENKINS.

DEVICE FOR LOCKING ELEVATORS.

APPLICATION YILED MAYlG, 1903f I 2 QHEETS-SHEET 1.

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' Patented October 6, 1903.

PATENT OFFICE.

DANIEL C. JENKINS, OF ALLEGHENY, PENNSYLVANIA.

DEVICE FOR LOOKING ELEVATORS. Y

SPECIFICATION forming part of Letters Patent No. 740,568, dated 06170 06 6, 1903.

Zipplication filed May 15, 1903- To all whom, it nuty concern:

Be it known that I, DANIEL G. JENKINS, of the city of Allegheny, county of Allegheny, and State of Pennsylvania, have invented a new and useful Improvement in Devices for Looking Elevators, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which- Fignre 1 is a side elevation of the top beam of an elevatorcar provided with my improved locking devices. Fig. 2 is a plan view of the same, and Fig. 3 is a diagrammatic view showing the electric circuits and the pneumatic or hydraulic connections by means of which the locking apparatus is automatically operated.

My invention relates to devices for locking the elevator-car whenever the door of the elevator shall be opened and releasing the car when the door is closed, so that it shall be impossible for the car to be moved when the door is open; and it consists in a lock adapt ed to be operated through suitable connections by the opening and closing of the door and in the particular devices employed, as hereinafter more fully set forth.

I will now describe my invention, so that others skilled in the art may manufacture and use the same.

In the drawings, 2 2 represent the two parallel beams on the top of the elevator-car. On either side of the hoisting-ropes 3 are pneumatic cylinders 4,-provided with piston and piston-rods 5 5. The outer ends of the piston-rods are provided with toggle-levers 6, which toggle-levers are provided with heads 7, which fit in a slot in the sliding bars 8, which bars are mounted in ways 9 on top of the beams 2. Plvoted to the ways 9 are arms 10 10, the outer endsof which are pivoted to the lever-arms 11 11 of the clutch or lock 12 12, the arms being pivoted by bolts 13 13 to the frame of the elevator-car and the jaws 12 12 being adapted to bite upon the elevator-tracks 14 14. Thus the arms 10 and 11 make a toggle-lever connection with the slide 8. Pneumatic pipes 15 open into the cylinders 4 4, and from these cylinders they lead to the basement, where they are connected with suitable inlet and-exhaust valves, only one of which is shown in the drawings. This Serial No. 157,292. (No model.)

valve is composed of an inlet-port 16, which leads from asupply of compressed air, an exhaust-port 17 which exhausts into the open air, and a valve-stem 18, at the ends of which are the inlet 19 and the exhaust 20. Above the valve 19 is a magnet 21, adapted to attractan armature connected with the'valve, so as to lift the same, and thereby close the exhaust-valve 20 and open the inletvalve 19 and to release the valve, so that it may drop by gravity and open the eXhaust-valve'20 and close the inlet-valve 19. This magnet is 0perated by an electric circuit 22, which leads from a source of energy and opens and closes by a switch 23. At each floor the circuit extends to a switch 24, provided with two arms and 26, one of which is adapted to be struck by the top of the door 27 as the door is thrown open, and thereby operate the switch and close the electric circuit, as is shown in the upper portion of Fig. 3. When this switch is so operated, the circuit is closed and the magnet 21 is energized, which lifts the armature connected with the valves 20 and 19 and allows the air-pressure to pass through the pipes 15 to the cylinders 1 and to push forward the piston and piston-rod 5, and thus operate the toggle-lever 6 and head 7, and pushes back the slide 8, which in turn operates the toggle-arms l0 and 11 and closes the jaws 12 on the elevator-track 14, thus effectually locking the elevator-car and preventing it from being raised or lowered until the electric circuit is broken. When the elevator-door 27 is closed, the top of the door strikes the arm 25 of the switch 24 and breaks thecircuit, whereby the magnet is denergized and the armature connected with the valves 19 and 20 is released, the inlet-valve 19 is closed, and the exhaust valve 20 is opened, allowing. the compressed air to pass out of the cylinder 4 through the pipe 15, whereby the head of the piston 5 is free to retract in thecylinder 4 and the power of the elevator-car will be suiiicient to open the jaws 12 on the track 14, allowing the carto ascend or descend. If desired, a spring 28 may be placed between the piston-head and the head of the cylinder at, which spring will retract the piston as soon as the pressure is removed. The part of the pipe 15 which is connected with the elevator-car should be in the form of a hose or flexible pipe to permit of the movement of the car.

Although I have shown a certain form of pneumatic valve and a certain arrangement of electric circuits and switches, I do not desire to limit myself to the same, nor do I desire to limit my invention to the particular forms of cylinder and locking devices which I have shown and described, as other equivple in construction and operation. Having thus described my invention, What I claim, and desire to secure by Letters Patcut, is-.

1. In devices for locking elevator-cars, the combination of a lock adapted to engage with a stationary part of the elevator-frame, a pneumatic motor adapted to operate the lock, an electric circuit adapted to start and stop the motor, and a switch arranged to be opened and closed by the movement of the elevatordoor.

2. In devices for locking elevator-cars, the combination of a lock adapted to engage with a stationary part of the elevator-frame, a pneumatic motor, an electric magnet adapted to operate the inlet and exhaust valves of the motor, a circuit connected with the magnet, and a switch arranged to be operated by the opening and closing of the elevatordoor.

DANIEL C. JENKINS.

Witnesses:

A. M. STEEN, JAMES K. BAKEWELL. 

